From http://en.wikipedia.org/wiki/Jolla

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As Jolla's Sailfish OS use the Mer core distribution then it can be used with various hardware, like ARM or Intel and many others. It is possible because the Mer core distribution does not contain neither a kernel nor UI, but libraries above kernel and below UI layers. To make a working Linux distribution a specific kernel compatible with a particular hardware and a UI (like Jolla UI in Sailfish) are to be added - this creates the distribution of Linux MeeGo Sailfish OS for particular hardware. Also this allows Sailfish OS with appropriate kernel to work on every hardware. Because of open source basis and rules it can be used by all interested in using of those solutions e.g. to adopt for a particular hardware or any special needs
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Now I get it!